Exhaust-nozzle



2 Sheets Sheet 1.

(No Model.)

H. G. REAGAN, J1.

EXHAUST NOZZLE.

No..493,'783. Patented Mar. 2l, 1893,

L Vdi/ges@ wz llll llrllllilll- 1H: Noims PETERS co, Pun'rouma.WASHINGTON, nV c.

2 Sheets l'Sheet 2.

(No Model.)V

H. C. REAGAN, Jr.

EXHAUST NOZZLE.

No. 493,783. Patented Mar. 21, 1893,

. UNITED STATES PATENT OFFICE.

HARRY C. REAGAN, JR., OF PHILADELPHIA, PENNSYLVANIA.

EXHAUST- NOZZLE.

SPECIFICATION forming part of Letters Patent N o. 493,783, dated March21, 1893.

Original application tiled April 19. 1892, Serial No.397,988. Dividedand this application filed May 2, 1892. Serial No. l

l161,521. (No model.) Y

To cir/ZZ whom it may concern: p

Be it known that I, HARRY C. REAGAN, Jr., a citizen of the UnitedStates, residing at West Philadelphia, in the county of Philadelphia andState of Pennsylvania, haveinvented certain new and useful Improvementsin Exhaust-Nozzles; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification.

Myinvention relates to steam engines, and especially to compoundlocomotives. Its object is to increase the efliciency of said machinesby so arranging the exhaust nozzles as to produce a vacuum in the lowpressure cylinder.

The invention consists in certain novel features of construction andarrangement hereinafter pointed out and claimed.

In the drawings, Figure lis a transverse Vertical section of a highpressure and a low pressure cylinder and their exhaust passages, and ofmy improved exhaust nozzle. Fig. 2 is a sectional elevation of amodified nozzle. Fig. 3 is a top plan view of the same, and Fig. 4 is across section of Fig. l on line 4 4.

My improved nozzle is composed of two concentric nozzles, an outer one Afor the exhaust of the high pressure cylinder B, and an inner one C forthe low pressure exhaust from the cylinder D. The outer nozzle isessentially conical, having two opposite openings a a at its base toafford connections for the high pressure exhaust pipes b h. This conicalportion is surmounted by a cylindrical pipe 0.2. Theinner nozzle ispreferably slightly conical, and rises centrally to a point somewhatbelow the junction of the conical portion of the outer nozzle, and itsupper pipe a2, leaving a narrow annular space a3 for the passage of thehigh pressure steam.

Midway between the openings a a', on each side of the nozzle C is a webE, which unites the two nozzles. A lip a4 is cast upon the inside of theconical portion above each opening ct a', and about on a level with orslightly above the top of the webs E. This lip and the curved base ofthe webs serve to deflect the entering high pressure steam and send itobliquely upward, whereby it is caused to completely envelop the innernozzle and issue through the entire circumference of the passage d3. Theeffect of this upon the inner nozzle is similar to that of an ejector,causing a powerful vacuum in said nozzle C and behind the low pressurepiston,greatly increasing the efficiency of the latter.

In order to provide for an adjustment of the size of the passage a3, Imay make the upper part of the nozzle separate from the lower as shownin Fig. 2, each part having a flange a5, which enables them to be boltedtogether. Between the flanges is clamped a ring F, the inner diameter orthe thickness of which determines the size of the opening around theinner nozzle C. By using rings of different internal diameters orthicknesses, this opening can be altered to suit varying conditions ofpressure, ratio of cylinders, &c., since a ring of smaller diameter thanthe one shown contracts the space between it and the inner nozzle C,while a ring of less thickness causes the conical portion of the upperpart A to appreach more closely to the upper end of the nozzle C, andthus narrows the openin g a3. It is evident that the line of separationbetween the upper and the lower parts may be located anywhere below thetop of the inner nozzle C in the conical portion of the outer nozzle. Inthe case of a four cylinder compound, in which there is a low pressurecylinder on each side of the engine, the low pressure pipe shown in Fig.2 is used. This consists of an upright part H, bolted to iianges on thebottom of the nozzle, and in line with the inner nozzle C. The lower endof the pipe H has two opposite branches H H with which communicate theexhaust pipes from the low pressure cylinders. A diametrical web orpartition h divides the pipe H into two parts for a portion of itslength, and directs the exhaust steam up to the nozzle C.

When it is desired to increase the force of the ejector, or to obtainavacuum at starting, the upper part A' of the nozzle may be providedwith an annular chamber a6 surrounding the mouth of thenozzle and havinga discharge opening concentric therewith. Steam from the boiler isadmitted to a pipe Gr, by which it is conveyed to the chamber d6, and

IOO

issuing around the nozzle A, it augments the blast.

I am aware that it has been proposed to arrange the high pressureexhaust nozzle inside of the low pressure exhaust nozzle in a compoundlocomotive, and I do not claim broadly the concentric arrangement ofsuch nozzles.

This application is in part a division of the application Serial No.397,988, upon which Patent- No. 473,437 was granted to me on April 19,1892.

Having thus described my invention, what I do claim, and desire tosecure by Letters Patent, is- 4 l. In a compound locomotive, an exhaustnozzle consisting of a conical portion havingr connections for the highpressure exhaust pipe and the low pressure exhaust pipe, the dischargepipe for the latter being within and concentric with said conicalportion, and terminating below its upper end, substantially asdescribed.

2. In a compound locomotive, an exhaust f the high pressure exhaustpipes, a cylindrical pipe a2 surmounting the conical portion, and anozzle C for the low pressure exhaust arranged concentrically within theportion A and terminating below the junction of said portion and thepipe a2, substantially as described.

3. In an exhaust nozzle, the combination with the conical portion Ahaving openings a a', and lips a, of the inner concentric nozzle C, andthe curved Webs E uniting said nozzle and conical portion, substantiallyas described.

4:. In an exhaust nozzle, the combination with the lower part A, ofthe-inner nozzle C, the upper part A extending above the nozzle C andhaving an annular chamber a6, provided with a discharge openingconcentric with the mouth of the nozzle A', and a pipe G for connectingsaid chamber with the boiler, substantially as described. v

In testimony whereof Iaftix my signature in presence of two witnesses.

HARRY C. REAGAN, JR.

Witnesses:

A. L. MULHERN, JOSEPH THoMAssoN.

